There is actually a voltage standard using the REF102. Many of them
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140 REF102 in four blocks of 35. Each block in an oven and heated to 44 °C +- 0.03 °C.
The circuit seems simple: Just 35 references in parallel (100 Ohm 0.1% resistors) and a 15 V +- 10 mV programmable supply for each block.
Result: "A proposed multi-zener based voltage-standard-source was analyzed during 11 years of operation. Its
internal noise was evaluated in 0.03 µV/V at one year averaging time, and 0.005 µV/V at 4 h
averaging time. The maximum variation during 11 years was 0.16 µV/V, with a drift of -0.009 µV/V
per year which is well below the calibration uncertainty." 1)
Four calibrations/comparisons were done against Josephson standards.
1) "Eleven years of monitoring an ultra-stable 10 V zener-based voltage standard", Souza et al., 2015
https://www.researchgate.net/publication/305800682_Eleven_years_of_monitoring_an_ultra-stable_10_V_zener-based_voltage_standard2) "FUENTE PATRÓN DE TENSIÓN BASADA EN MÚLTIPLES ZENERS" Slomowitz et al., 2005
http://iie.fing.edu.uy/publicaciones/2005/STD05/STD05.pdf